ha, I lied! The sawtooth is one that I made and added to the list of presets. You can make one pretty easily, then add it to the list of presets by scrolling it to the gray square, and clicking on it. voila! (a sawtooth looks like this:)

   /|   /|   /|   /|
  / |  / |  / |  / |
 /  | /  | /  | /  |
/   |/   |/   |/   |

Hold down option/alt and click to delete one of the presets if you don't like it. They're persistent from project to project. Happy spinning